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Inventory (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of inventories [Abstract] |
Disclosure Of The Components Of Inventories | The components of inventory are as follows:
As at Dec. 31 | 2020 | 2019
Parts and materials | 107 |  | 108 |
Coal | 83 |  | 130 |
Deferred stripping costs | 8 |  | 6 |
Natural gas | 2 |  | 3 |
Purchased emission credits(1) | 38 |  | 4 |
Total | 238 |  | 251 |
(1) Purchased emissions credits increased due to trading and compliance credits purchased, including those for Alberta compliance under the Technology Innovation and Emissions Reduction program.
Disclosure Of The Change In Inventory | The change in inventory is as follows:
Balance, Dec. 31, 2018 | 242 |
Net addition | 12 |
Change in foreign exchange rates | (3) |
Balance, Dec. 31, 2019 | 251 |
Net addition | 26 |
Writedowns | (37) |
Change in foreign exchange rates | (2) |
Balance, Dec. 31, 2020 | 238 |

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